FWIW, politics are dirty.

http://www.newsweek.com/bernie-sanders-hillary-clinton-primary-616682

A complaint filed against Sen. Bernie Sanders by a Hillary Clinton super PAC during the 2016 Democratic primary campaign was dismissed by the Federal Election Commission last month. Filed last April, the commission's decision, published by Politico Friday, was only placed on public record in recent days.

“Just one day after the Clinton campaign said we needed to change our tone, the leaders of their coordinated super PAC, which is funded by millions from Wall Street, filed baseless and frivolous complaints with the FEC,” Sanders campaign manager Jeff Weaver said at the end of March 2016. “Tells you all you need to know.”

...Brock wrote in January in an open letter to Sanders, posted on Medium.

He added: “At times during the Democratic primary, I was criticized for being too aggressive in my support for Secretary Clinton—and rightly so. Looking back, I recognize that there were a few moments when my drive to put Hillary in the White House led me to take too stiff a jab. I own up to that, I regret it, and I apologize to you and your supporters for it.”

Despite ending almost a year ago, the ill feeling over the primary remains. A lawsuit accusing the Democratic National Committee of fraud, deceptive conduct and negligent misrepresentation over its alleged favoring of Clinton over Sanders is ongoing.